Chuck-holder.



.C. CULMAN.

CHUCK HOLDER.

' APPLICATION FILED AUG-10,1914. 1 14 671 Patented May 23,1916.

L-SHEET THE COLUMBIA PLANOGRAPH c0., WASHINGTON. AL A C. CULMAN.

CHUCK HOLDER. APPLiCATION FILED Aumo. 1914.

1,1 8&6? 1 Patented May 23, 1916.

2 SHEETS-SHEET 2.

pairs ea CHUCK-HOLDER.

Specification of Letters Patent.

Patented llllay 23, 1916.

Application filed August 10, 1914. Serial No. 856,024.

To all whom it may concern Be it known that I, CARL GULMAN, a citizen of the United States, residing at Maplewood, in the county of St. Louis and State of Missouri, have invented certain new and useful Improvements in Chuck-Holders, of which the following is a specification.

This invention relates to rotary work holding devices, and more particularly, to work holding devices for small tools, such as, watchmakers lathes.

In turning small work, such as parts of watches, the work is held in a universal chuck centered in the spindle of the lathe. Now, such a universal chuck, as found on the market, is not entirely accurate, but will cause the work to rotate with a slight eccentricity. This is objectionable where the work must be accurate. It is also only possible, with such a chuck, to turn Work where the part operated upon is concentric with respect to the part which is gripped by the chuck, and it is not possible to operate on work where the two parts are eccentric with respect to each other. The work gripping chucks, as now used, comprise each a shank adapted to enter the spindle of the lathe, and it is, therefore, necessary to keep in stock a considerable number of these chucks for work of varying sizes.

One of the objects of this invention, therefore, is to construct a work holding device which not alone perm-its accurate centering of the work, but also has a universal application to different classes of work, whether the parts thereon are concentric or eccentric with respect to each other.

Another object is to construct a chuck holding device which will permit centering of the chuck thereon and of the work gripped by the chuck.

Another object is to construct a device which is simple in construction and operation, cheap to manufacture, and which will require a few and inexpensive parts to be kept in stock.

Further objects will appear from the detail description taken in connection with the accompanying drawings, in which:

Figure 1 is a side elevation of a chuck holder embodying this invention; Fig. 2 is a front elevation; Fig. 3 is a section on the line 33 Fig. 2; Fig. 4 is a Sid vation of Fig. 1 with the adjusting sleeve removed; Fig. 5 is a detail perspective view; Fig. 6, is a front elevation showing another embodiment of this invention; Fig. 7 is a section on the line 7-7, Fig. 6; Figure 8 is a front elevation showing another embodiment of this invention; Fig. 9 is a section on the line 9-9, Fig. 8; Fig.

'10 is a section on the line 10-10, Fig. 9;

Fig. 11 is a section on the line 1111, Fig. 9; Fig. 12 is a front elevation showing still another embodiment of this invention; Fig. 13 is a section on the line 1813, Fig. }1l2 and, Fig. 14 is a detail end view of the Referring to Figs. 1 to 5 inclusive, 10 designates a shank adapted to be inserted into the spindle of an ordinary jewelers lathe. threaded head 11 having a flange 12 forming a face plate, and which is slotted or recessed, as shown at 13. A collar 14 is threaded on the head 11, and has an annular groove 15 adapted to receive a forked carrier 16 which is adapted to be slipped over the collar. The carrier 16 is provided with arms 17 pivoted thereto at 18 and adapted to engage the slots 13 in the flange 12. The arms 17 have jaws 19 which extend radially when the parts are in the positions shown in the drawing. A knurled sleeve 20 slips over the flange 12 and the collar 14, and is provided with slots 21 adapted to engage radial lugs 22 on the collar 14. When the sleeve 20 is removed, the arms 17 can be swung outwardly and can then be removed with the carrier. When the device is assembled, as shown in Figs. 1, 2' and 3, rotation of the sleeve 20 will cause rotation of the collar 14, and will adjust this collar, together with the carrier and the jaws 19 thereon, longitudinally of the shank 10, the arms 17 being guided in the slots 13. The jaws 19 are utilized for holding the chuck in a manner hereinafter to be described.

The chuck may be of any suitable form and, in this particular embodiment, comprises a tapering externally threaded part 30, which is split, as shown at 31, and internally counter-bored to form a series (in this case three) of jaws 32 adapted to open and close to grip the work 33. The jaws are normally retained open by their inherent resiliency, and are closed by a knurled collar .39 threaded thereon. The jaws have This shank is provided with a which-1 is-.:locked in position by a pin 46, or.

formed thereon a flange or disk shaped part 34 adapted to be placed against the face plate 12 and, retained thereon by *the Jjaws 19.

In order to center the work, the shank 10 is internally bored .to receive a plunger or pump center 35 formed with a conical recess 36 in its "forward Q11d, and :pressed forwardly by a. spring 37 hearing, at one end, against the plunger and, at theother I send, against aplug 38.

The :operation of. .this device is as fol- .1...Q)N.S:: The work-3,3, which maybe a balance staff, ;r any other suitable :piece of work, is clamped :inithe aj-aws 3.0 of the chuck which :is .placed :la gai'nst the faceplate '12 hy-slip- ;ping:the1fla-nge 34: betweenethe jaws :19. The work, fbeing partially centered by the plun- I yger .35., the ;.chuck is now ilightly clamped .agaignst the fface plate day the. clamping ,;sle.e.ue 20. The chuck isnow spun in the Blat'he, :and, 'by holding ;a ;tool.1a gai-nst .the

work "'83, this work will he automatically.

' centered due to the fact that the chuck is only li-ghtly clamped. After the workhas libeen centered, :the :clamping slew-e120 iis etunned sup *tortightly clamp :the: chuck ion the face plate. 7 .Referring, .now, sto "Figs. '6 :and '7, achuck 3O 'hol'dingdeviceisihererscrewed directly onto ethespindle of the lathe. In :this construction, t=he shank AZiis provided with ahead d3 which :is internally threaded to :screw iontoilthe sp-i ndledLof the lathe. ilheshank ithreaded to receive the .face :plate 4L5,

' iinll-aalyuother suitablezmanner; 'iThe .cOllar A7 is :threaded-on the shank 42 andhas :a

' :ifl-ange 48 threaded' ithereon and looked in iposition by ;a :pin 49 :to' 'formian iannular =rercess' for the :jawwcarrier :50. This'jaw caraiier is, lIlithiS case, in the iform of an annular ring, land has pivoted :thereto the arms 11-7,. which aims, together with the other ipartslofthe .'device, :are of the same con- .is'tructionas shown in Figs. 1 to 5 :inclusive,

and are designated day the same reference characters. The ioperation of this device is isub stantial ly thesame as in .the construction 50 :show-nin Figs. 1 to 5 iinclusi've.

" Referring, now, ato. Figs; :8 to :11 :inclu- .qsi ve, 5'5 designates the spindle :of the lathe, which has mounted thereon a :face plate :56. A knurled :disk :'5.7 :is :mounted on the-:spindie 'so as to rotate ;and slide thereon.

' Angular shanks r58 pass through .and .are

j 'i guided-in square holes in-the face plate 56,

:andpass' througfhwslots 59 in :the :knurled disk 57, these zshanks being provided with heads 1'67 in the rear of :the rlmurled disk.

I cei-ve balls 63, while ithei knu-nled :disk .57

has cam recesses 65 of increasing depth to engage the balls. The shanks 58 are pref- '-erably provided with light springs to noring EQQlitifliIl classes of ;-wor k. This .can' be .accomplishediby turning them through one hundred {eighty degrees :(.l8O

Referring, now, to Figs. 12, .13aand 1d, designates .a lathe .spindle which has .iscrewed {thereon .a yhub 71 ,provided with .anintegrallfface plate ,72. Thehub 71 is externally, threaded to ageceive a knurled adjusting disk "or collar 73. The hub 71 is 1. slotted, as shown; at 6.9, to ,receive; the. shanks 714, 40f .squa-re section, which carry ,the jaws .75. The shanks 74- .areeach provided with ;a dug =76, ,sengaging-one side of the collar .73,

'; and with; a pin 17.7 :tapped into :the shank, and

engaging the..=othe1' side .of the collar 73. it will :be' obvious ;that adjustment of the .collar '73 will realise an adjustment .of the zjfiMS 15 toward :and ifroin ithe face 'plate. The iiaws75 ean Joe-swung through one hundred (eighty degrees 1809), .as .shown in dotted lines, Fig. 112, on .account of being 'ithreaded route ,the shanks 7.4. The operation 13151165631116 as the :devices [heretofore described.

The #work :holding device is simple :in construction and operation, and has a .uni-

-ve1'salapplication. The .chuck, and the work gripped thereby, is self-centered, and this Zcentiering 1 of (the work is obtained wvith igreater accuracythen can be obtained with :the :universal Cl1l10k. The part .of the work to [be operated @upon is centered, whether tt'his ipant is .concentric oreecentric with .re- .spectito the pant'grippedby the chuck. The pump :center .operates not only -to .center the work in the chuck holder, but actsalso was 13:11 end hearing for holding the .end of the work. .The uZhuek .can he removed and ireplaced with ;great facility, .and different sizes of work can, therefore, be :changed with greater rapidity than in accordance. with the old ,method, .where .the entire ;chuck must be removed from and .replaced in :the spindle. ,A series .of chucks .can .be provided for varying sizesof work, -;each .chuck taking diiferent diameters of Work, within certain limits. The .eguipmcnt .required is, therefore, :not as expensive and requires .less ;-spac.e and material than-in accordance with .the :old method, since :a full equipment rei-quires'only asiugle chuck holder .and a series :of .ChuGkS- It is obvious that various changes may be made in details of construction within the scope of the appended claims without departing from the spirit of this invention, and it is, therefore, to be understood that this invention is not to be limited to the specific construction shown and described.

Having thus described the invention, what is claimed is:

1. A rotary chuck holding device, comprising a part adapted for engagement with a lathe and having a face plate, a chuck provided with means for holding the work therein, said chuck being adjustable over the face plate to center the work with respect to the lathe spindle, a plurality of axially movable jaws adapted to engage the chuck at relatively distinct points, and means for operating said jaws in unison to clamp the chuck, when adjusted, to the face plate.

2. A rotary chuck holding device, comprising a part adapted for engagement with a lathe and having a face plate, a chuck provided with work holding means, said chuck being adjustable over the face plate to center the work with respect to the lathe spindle, a plurality of axially movable jaws having hooked outer ends to engage the chuck at relatively distinct points, and means for operating said jaws in unison to clamp the chuck, when adjusted, to the face plate.

3. A rotary chuck holding device, comprising a part adapted for engagement with a lathe and having a face plate, a chuck provided with work holding means and having a flange adapted to bear on the face plate, said chuck being adjustable over the face plate to center the work with respect to the lathe spindle, a plurality of axially movable jaws having hooked outer ends to engage said flange at relatively distinct points, and means for operating said jaws in unison to clamp the chuck, when adjusted to the face plate.

4. A rotary chuck holding device, comprising a part adapted for attachment to a lathe and having a face plate, a :work gripping chuck adjustable on said plate to center the work with respect to the lathe spindle, means arranged axially of said face plate and operating by engagement with the work for automatically adjusting said chuck on said face plate, a plurality of axially movable jaws adapted to adjustably clamp said chuck to said face plate, and means for operating said jaws in unison, constructed to permit adjusting and clamping of said chuck on said face plate.

5. A rotary chuck holder, comprising a part adapted for attachment to a lathe and having a face plate, a plurality of distinct aws mounted to move axially of said face plate and adapted to clamp a work holding chuck to said face plate, and means for operating said jaws in unison, constructed to permit adjustment of the chuck to center the work on said face plate.

6. A rotary chuck holder, comprising a shank adapted for attachment to a lathe and having a face plate, a plurality of distinct jaws mounted to move axially of said face plate and adapted to clamp a work holding chuck to said face plate, and a rotary member mounted on said shank for operating said jaws in unison, constructed to permit adj ustment of the chuck to center the work on said face plate.

7. A rotary chuck holder, comprising a shank adapted for attachment to a lathe and having a face plate, a plurality of distinct jaws mounted to move axially of said face plate and adapted to clamp a work holding chuck to said face plate, and a rotary collar threaded on said shank for operating said jaws in unison, constructed to permit adjustment of the chuck to center the work on said face plate.

8. A rotary chuck holder, comprising a shank adapted for attachment to a lathe and having a face plate, a collar threaded on said shank, and a plurality of distinct axially movable jaws pivoted on said collar and projecting beyond said face plate, adapted to clamp a work holding chuck to said face plate, said parts being constructed to permit adjustment of the chuck to center the work on said face plate.

9. A rotary chuck holder, comprising a shank adapted for attachment to a lathe and having a face plate, a collar threaded on said shank, and a plurality of distinct axially movable hooked jaws pivoted on said collar and projecting beyond said face plate, said jaws being adapted to clamp a work holding chuck to said face plate and to permit adjustment of said chuck over the face plate for centering the work.

10. A rotary chuck holder, comprising a shank adapted for attachment to a lathe and having a face plate, a collar threaded on said shank, a carrier removably mounted on said collar, and a plurality of distinct axially movable jaws pivoted on said carrier and projecting beyond said face plate, said jaws being adapted to clamp a work holding chuck to said face plate and permit adjustment of said chuck over the face plate to center the work.

11. A rotary chuck holder, comprising a shank adapted for attachment to a lathe and having a face plate, a collar threaded on said shank, a plurality of distinct jaws n1ovably mounted on said collar and projecting beyond said faceplate, said jaws being adapted to clamp a work holding chuck to said face plate and permit adjustment of said chuck over the face plate to center the work, and a sleeve connected with said collar and adapted to retain said jaws in chuck engaging position.

es I 1 8% l2, A rotary chuck holdel comp rjising a erating said 'jaws in unison, adapted to repart adapted for attachment to a lathe and tain said a-jawsin chuck engagingmosition. 10 having a face :plate, a AVOIk vhclding chuck In-testlmony whereof I aifix my signature adjustable thereover toicentervthe Work with in the presence of these two .witnesses.

5 respect to the lathe spindle, a plurality of CARL CULMAN.

distinct axiallytmovablej aWs associated With Witnesses:

' said 'face plate and adapted to adjustably ,J. H. BRUNINGA,

clamp the chuck thereto,rand means for-op DOUGLAS H. J ONES.

Copies this patent may be obtained for five cents each, byaddressing ,the Commissioner or l'atents. L;- Wish1ngton, D.G. 

